Re: When can String.enumerateSubstringsInRange ever pass in NIL?
Re: When can String.enumerateSubstringsInRange ever pass in NIL?
- Subject: Re: When can String.enumerateSubstringsInRange ever pass in NIL?
- From: Daryle Walker <email@hidden>
- Date: Thu, 02 Jun 2016 19:30:05 -0400
But with your way, the method can't be reasonably unit-tested since a NIL may come up randomly. That seems pointless since you can synthesize the string from the other parameters anyway.
Sent from my iPhone
> On May 30, 2016, at 5:42 AM, Quincey Morris <email@hidden> wrote:
>
>> On May 29, 2016, at 22:31 , Ken Thomases <email@hidden> wrote:
>>
>> I think the documentation for SubstringNotRequired is sufficient design contract:
>>
>> "NSStringEnumerationSubstringNotRequired
>> "A way to indicate that the block does not need substring, in which case nil will be passed. This is simply a performance shortcut."
>
> This contract is of the form “if A then B”, from which it is NOT generally valid to conclude “if not-A then not-B”. Plausibly, you can read a hidden “only” into the documentation, but I’d still suggest not relying on it, since it seems unnecessary.
>
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